How do I modify a search query in WordPress?

Question

I am using WordPress and have a search box in the header. It searches on the basis of posts. Now I want to modify this search box with a cities drop down search box. I also added a new cities table in the database. I need to run the search box on the basis of cities.

Answer 1

You can simply add following code in your functions.php file in your WordPress theme directory.

function searchfilter($query) {

if ($query->is_search && !is_admin() ) {
    $query->set('post_type',array('trip'));
}

return $query;
}

add_filter('pre_get_posts','searchfilter');

Here trip is my custom post type and now default search function of WordPress will only search in custom post type trip. You can modify it according to your requirements.